[1] I. Fredholm, Sur une classe d'equations fonctionnelles, Acta Math. 27(1) (1903), 365 390 (in French).

[2] Herman Gluck and Frank W. Warner, Great circle fibrations of the three-sphere, Duke Math. J. 50(1) (1983), 107-132.

[3] Paul R. Goodey and Ralph Howard, Processes of flats induced by higher-dimensional processes, II. Integral geometry and tomography (Arcata, CA, 1989), 111-119, Contemp. Math., 113, Amer. Math. Soc., Providence, RI, 1990.

[4] H. Groemer, Geometric applications of Fourier series and spherical harmonics, Encyclopedia of Mathematics and its Applications, 61, Cambridge University Press, Cambridge, 1996.

[5] A. Koldobsky, Inverse formula for the Blaschke-Levy representation with applications to zonoids and sections of star bodies, preprint.

[6] Rolf Schneider, Convex bodies: the Brunn-Minkowski theory, Encyclopedia of Mathematics and its Applications, 44, Cambridge University Press, Cambridge, 1993.

[7] Loup Verlet, Integral equations for classical fluids, Molecular Physics 42(6) (1981), 1291-1302.

[8] Abdul-Majid Wazwaz, A First Course in Integral Equations, World Scientific Publishing Co., Inc., River Edge, NJ, 1997.